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can I make the side pipes quieter? - Club Cobra
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  #1 (permalink)  
Old 07-15-2017, 06:20 PM
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Default can I make the side pipes quieter?

I never thought I would be asking this, but is there a way to reduce the sound from my sidepipes

I have a kirkham with a big FE with an aggressive cam. Straight headers and kirkham's sidepipes. It is very loud. I like loud cars, and my other cars are loud, but the neighbors are running away when they see me coming.

i have read about using flowmaster sidepipes, but i would like to try to preserve my polished sidepipes because I have so much invested in them and they look so good.

I have read about different inserts for the glasspack, but they seem to require insertion before the ends are welded together.

Is there something I can slide inside the turnout of the sidepipe that might work? i can't imagine what that would be.
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Old 07-15-2017, 07:19 PM
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Try contacting the people at MEACO Motorsports. Somewhere I saw a picture 427" sidepipes with a SUPERTRAPP adjustable muffler inserted into the tip.

The "SUPERTRAPP" is held in place with springs...tabs are welded to the exhaust end.

http://www.maecomotorsport.com/Index...e6TheCars.html

SuperTrapp: Performance Exhaust

Wish I could fine the pictures. At one time I thought there were at the MEACO website but I don't see them this evening.

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Old 07-16-2017, 06:12 AM
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I think you'd be happy with the flowmasters as they are a bit queter than the factory Backdraft ones. Granted it won't help you judge the Kirkam...
They do polish out nicely (stainless steel) and I did have to spend a few hours sanding and buffing though before the welding. Once welded up I only had to go back over the joints with Black and Green Rouge.
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Old 07-16-2017, 07:04 AM
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This is not an uncommon issue with big block Cobra owners. You want your pipes at a level where you still enjoy the sound, it's clear that it's a nice performance big block, but you don't want a throbbing headache, nor do you want to have to wear ear plugs. I can't tell if Stainless Specialties in Cleveland is still in business or not, because it looks like their web site has lapsed. But they used to build "quiet type" side pipes for several ERA owners, including me. Here's a thread on it: ERA "quiet" pipes The pipes are absolutely wonderful and, if they're still in business (I think they are), I'm sure they could retrofit your existing pipes to make you happy. Their web site used to have a lot of good info, pics, and descriptions of the different baffling, sizes, etc. for side pipes. But now you're just going to have to call them up and chat with them.
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Old 07-16-2017, 08:06 AM
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Quote:
Originally Posted by jkg2101 View Post
i would like to try to preserve my polished sidepipes because I have so much invested in them and they look so good.
The real answer is No.

Without cutting the pipes apart there isn't much you can do. A lot of people have tried a number of inserts that claim significant reductions. Here's an example. But they really don't do much. You might get 1-2dB reduction at best. Usually less than that.

https://www.summitracing.com/parts/d...0aAnOpEALw_wcB



If you want a significant noise reduction, you need to sell the pipes you have and start over with a clean slate.
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Old 07-16-2017, 11:10 AM
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I'd say no. It's just the nature of the car.

I just buy a big box of disposable ear plugs and use them when I drive the car. Interestingly I can still hear the stereo pretty well with the earplugs in but they just attenuate the side pipe and wind noise, and make the car very comfortable to drive on longer rides.
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Old 07-16-2017, 02:58 PM
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it's not so much that it bothers me, but more that i can't cruise through the neighborhood without scaring the moms and their babies in strollers. i'm even louder than the obnoxious harley down the street, and everyone has already complained to me about him

i found a forum posting about using patriot auger inserts, and making them flexible with springs between segments so they can be shoved inside i may try that. nothing to lose but effort
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Old 07-18-2017, 08:07 PM
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Funny story precaution; a couple weekends ago I drove my SPF to Lake Tahoe to see my folks at their summer house. Elev 6500 ft. Coming home I put in earphones to listen to music on the way home...the phones are rubber plugs that fit tight. I pulled them out in Sacramento, which is almost sea level...holy crap my ears re pressurized all at once my balance went and the horizon seemed to be moving, I was driving at the time! Terrifying few seconds...
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